東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Aerosol size distribution modeling f...

Elleman, Robert A.

Linked to FindBook

Google Book

Amazon

博客來

Aerosol size distribution modeling for the Pacific Northwest.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Aerosol size distribution modeling for the Pacific Northwest./
Author:	Elleman, Robert A.
Description:	219 p.
Notes:	Adviser: David S. Covert.
Contained By:	Dissertation Abstracts International68-02B.
Subject:	Atmospheric Sciences. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3252850

Aerosol size distribution modeling for the Pacific Northwest.
Elleman, Robert A.

Aerosol size distribution modeling for the Pacific Northwest. - 219 p.

Adviser: David S. Covert.

Thesis (Ph.D.)--University of Washington, 2007.

The goal of this project is to more accurately model the aerosol size distribution with the Community Multiscale Air Quality modeling system (CMAQ). The approach is to compare its performance to observations in the Pacific Northwest and to make improvements to the model science.Subjects--Topical Terms:

1019179
Atmospheric Sciences.

Aerosol size distribution modeling for the Pacific Northwest.
LDR:03128nam 2200277 a 45 001 948540
005 20110524
008 110524s2007 ||||||||||||||||| ||eng d
035 $a (UMI)AAI3252850
035 $a AAI3252850
040 $a UMI $c UMI
100 1 $a Elleman, Robert A. $3 1271994
245 1 0 $a Aerosol size distribution modeling for the Pacific Northwest.
300 $a 219 p.
500 $a Adviser: David S. Covert.
500 $a Source: Dissertation Abstracts International, Volume: 68-02, Section: B, page: 0837.
502 $a Thesis (Ph.D.)--University of Washington, 2007.
520 $a The goal of this project is to more accurately model the aerosol size distribution with the Community Multiscale Air Quality modeling system (CMAQ). The approach is to compare its performance to observations in the Pacific Northwest and to make improvements to the model science.
520 $a The official CMAQ v4.4 underpredicts the total particle number concentration by 1-2 orders of magnitude. The bias is consistent throughout the day and across the urban-influenced region. It becomes progressively worse for smaller sizes and is not associated with any particular chemical species, emissions source, or air mass aging. Errors in total aerosol loading, meteorology, and gaseous aerosol precursors do not show a pattern consistent with the number underprediction. Of all the aerosol processes that create and destroy particles in the urban environment, the nucleation of new particles and the emission size distributions in the official CMAQ v4.4 attract attention for their scientific deficiencies and their tendency to produce the observed errors.
520 $a The latest mechanisms for ternary NH3-H2SO 4-H2O nucleation and nucleation mode scavenging and growth are added to CMAQ, and the emission size distribution is updated to reflect modern mesoscale measurements. Modeled particle concentrations increase substantially, but they are still underpredicted by up to an order of magnitude. Nucleation changes are responsible for most of the increase but are also responsible for spatially inconsistent performance. Emissions updates increase the number of particles smoothly across urban-influenced areas by a factor of 2-4. The modeled size distributions, especially in the ultrafine range, are a better match to observations, although errors in the accumulation mode remain. The fact that these changes make a noticeable improvement in results adds weight to the premise that regional nucleation occurs regularly during the Puget Sound summer and that emissions of Aitken mode particles are an important component to the ambient aerosol size distribution. Although the updates to CMAQ represent only our incomplete understanding of aerosol pollution, they are able to reduce the underprediction of aerosol number concentrations and produce size distributions with the appropriate major features.
590 $a School code: 0250.
650 4 $a Atmospheric Sciences. $3 1019179
690 $a 0725
710 2 $a University of Washington. $3 545923
773 0 $t Dissertation Abstracts International $g 68-02B.
790 $a 0250
790 1 0 $a Covert, David S., $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3252850